#!/bin/sh
# This script is run once when the system first boots.  Its sole
# purpose is to create /etc/default/sysconf (the overall system
# configuration file) and other files derived from this.
#
# The script runs immediately after S10checkroot.sh - this is the
# point at which the rootfs will be mounted rw even if the kernel
# booted with it ro.
#
# rm or mv the file to run this again.  If this is done the
# following configuration files will be rewritten:
#
# /etc/default/sysconf
# /etc/hostname
# /etc/defaultdomain
# /etc/network/interfaces
# /etc/resolv.conf
#
test -r /etc/default/sysconf && exit 0
#
# /etc/default/functions contains useful utility functions - it's
# in a separate file so that it can be loaded by any script
. /etc/default/functions
#
# Utility to deal with absence of DNS configuration
echodns(){
	local dns
	if test $# -gt 0
	then
		for dns in "$@"
		do
			echo "nameserver $dns"
		done
	fi
}
#
# The SysConf device must exist in /dev at this point for this script
# to work.
#
# It is important not to hard-wire the name of the device because of
# the posibility of changing the flash partition layout.
sysdev="$(mtdev SysConf)"
if test -n "$sysdev" -a -c "$sysdev"
then
	# Read the defined part of SysConf into /etc/default/sysconf.
	# SysConf has lines of two forms:
	#
	#  [section]
	#  name=value
	#
	# In practice SysConf also contains other stuff, use the command:
	#
	#  devio '<</dev/mtd1;cpb'
	#
	# to examine the current settings.  The badly formatted stuff
	# is removed (to be exact, the sed script selects only lines
	# which match one of the two above).  The lan interface, which
	# defaults to ixp0, is changed to the correct value for openslug,
	# eth0
	devio '<<'"$sysdev"';cpb;fb1,10' | sed -n '/^\[[^][]*\]$/p;
		s/^lan_interface=ixp0$/lan_interface=eth0/;
		/^[-a-zA-Z0-9_][-a-zA-Z0-9_]*=/p' >/etc/default/sysconf
	#
	# Now take the result and set up the 'standard' files in the
	# root file system (these couldn't be set up before because
	# they depend on stuff which RedBoot puts into SysConf from the
	# ID info on the specific machine - in particular the hardware
	# address of eth0, which must be the one assigned for *this*
	# box!)
	#
	# HOSTNAME: defaults to LGK<mac> i.e. something derived from
	# the ethernet hardware.  LinkSys documentation explains how
	# to determine this.  Set by the user in linksys setup software.
	# DOMAINNAME: LinkSys puts this in w_d_name.
	test -n "$(config host)" && config host >/etc/hostname
	domain="$(config domain)"
	test -n "$domain" && echo "$domain" >/etc/defaultdomain
	#
	# Ethernet information.  This goes into /etc/network/interfaces,
	# however this is only used for static setup (and this is not
	# the default).  With dhcp the openslug udhcp script,
	# /etc/udhcpc.d/50default, loads the values from sysconf.  The
	# lan_interface config value must exist for the file to be
	# overwritten here.
	iface="$(config iface)"
	if test -n "$iface"
	then
		boot="$(config boot)"
		# Only dhcp and static are supported at present - bootp
		# support requires installation of appropriate packages
		# dhcp is the fail-safe
		case "$boot" in
		dhcp|static) ;;
		*)    boot=dhcp;;
		esac
		#
		mac="$(config mac)"
		ip="$(config ip)"
		netmask="$(config netmask)"
		gateway="$(config gateway)"
		{
			echo "# /etc/network/interfaces"
			echo "# configuration file for ifup(8), ifdown(8)"
			echo "#"
			echo "# The loopback interface"
			echo "auto lo"
			echo "iface lo inet loopback"
			echo "#"
			echo "# The NSLU2 built-in ethernet"
			echo "auto eth0"
			echo "# Automatically generated from /etc/default/sysconf"
			if test -n "$mac"
			then
				echo "# The pre-up option must always be supplied, regardless"
				echo "# of configuration, to set the hardware correctly."
				echo "# Severe network problems may result if this option is"
				echo "# removed."
				c=
			else
				echo "# WARNING: improperly configured network interface."
				echo "# WARNING: the pre-up line must be corrected or severe"
				echo "# WARNING: network problems may result."
				c='#'
				mac='<WARNING: unknown hardware address>'
			fi
			echo "iface $iface inet $boot"
			echo "${c}	pre-up ifconfig $iface hw ether $mac"
			# The following are ignored for DHCP but are harmless
			test -n "$ip"      && echo "	address $ip"
			test -n "$netmask" && echo "	netmask $netmask"
			test -n "$gateway" && echo "	gateway $gateway"
		} >/etc/network/interfaces
	fi
	#
	# The DNS server information gives up to three nameservers, but this
	# currently only binds in the first.
	{
		test -n "$domain" && echo "search $domain"
		echodns $(config dns) $(config dns1) $(config dns2)
	} >/etc/resolv.conf
fi

exit 0